At Amazon, Prime members can create a wedding registry and receive 20% off sitewide after the wedding is over as a completion gift (Non-Prime members can get 10% off). A maximum discount of $500 applies ($100 for non-Prime members) and items must be sold by Amazon.com. (Items sold by third-party merchants are not eligible.) That's the best such discount we've seen for wedding registry items from Amazon. The registry must be created at least 30 days before your wedding date and have had at least one item purchased from it. You'll receive a unique code within a month of your wedding date. Other exclusions may apply.